Canarium rigidum Zipp. ex Miq.

Slender tree up to 30 m by 40-45 cm diam. Branchlets rather stout, 7-12 mm thick, glabrous but for the tips; pith with a peripheral closed cylinder of small vascular strands. Stipules absent. Leaves 6-12-jugate, glabrous. Lateral petiolules 2-11 mm. Leaflets lanceolate, 6¼-15 by 1.25-4 cm, chartaceous; base rounded to subcordate; margin entire; apex gradually, long and slender-acuminate; nerves 15-20 pairs (angle 70-85°), irregular, not to faintly curved, abruptly arching at c. 1-2 mm from the margin; intermediate veins strongly developed. Inflorescences axillary, laxly paniculate, 10-20 cm long, glabrous, peduncle globular-thickened at the base; main branches sub-decussate, up to 5 cm, dichotomously branched, crowded-9-12-flowered. Female inflorescences 8-9 cm long, the partial inflorescences c. 2 cm long, with 1 or 2 flowers. Flowers sub-sessile, glabrous, 6 mm long. Calyx 3 mm high. Petals much incrassate towards the apex, the broadened and flattened margins of the apical part rugose. Stamens glabrous, 4.5-5 mm long, connate for 2 mm. Disk cushion-shaped with elevated margin, 1 mm high, minutely pubescent on the upper surface, with a central canal, but without a rudimentary pistil. ♀ Flowers 1½ mm long, the calyx 4.5 mm high, outside densely appressed pubescent; staminodes free outside the disk, 2 mm long; disk faintly lobed, c. 1 mm high, long-hairy towards the margin; pistil glabrous. Infructescences 12-25 cm long, with 1-3 fruits, glabrous; main branches up to 6 cm; calyx shallowly saucer-shaped with a 3-lobed margin; remains of a circular, fimbriate disk present. Fruits ellipsoid, tapering at the base, acuminate at the apex, rounded 6-angular in cross-section, 4 by 2-2.5 cm, glabrous; pericarp rather thick and fleshy; pyrene circular in cross-section with many irregular, longitudinal ribs, which are up to 5 mm high and 1-2 mm wide; lids 2½ mm thick. Seed 1, sterile cells only slightly reduced.

A canopy tree in dense primary forest and the more open, secondary formations; both at low elevations and ascending to 1,000-1,200 metres.

Uses. Reported to be used for buildings proas.

Can be grown by seedlings.